netdev - [PATCH net-next 6/9] ptp: ptp_clock: Publish scaled_ppm_to

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Message-Id: <20190603121244.3398-7-idosch@idosch.org>
Date:   Mon,  3 Jun 2019 15:12:41 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, richardcochran@...il.com, jiri@...lanox.com,
        shalomt@...lanox.com, petrm@...lanox.com, mlxsw@...lanox.com,
        Ido Schimmel <idosch@...lanox.com>
Subject: [PATCH net-next 6/9] ptp: ptp_clock: Publish scaled_ppm_to_ppb

From: Shalom Toledo <shalomt@...lanox.com>

Publish scaled_ppm_to_ppb to allow drivers to use it.

Signed-off-by: Shalom Toledo <shalomt@...lanox.com>
Reviewed-by: Petr Machata <petrm@...lanox.com>
Signed-off-by: Ido Schimmel <idosch@...lanox.com>
---
 drivers/ptp/ptp_clock.c          | 5 +++--
 include/linux/ptp_clock_kernel.h | 8 ++++++++
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c
index e189fa1be21e..f0893953b503 100644
--- a/drivers/ptp/ptp_clock.c
+++ b/drivers/ptp/ptp_clock.c
@@ -63,7 +63,7 @@ static void enqueue_external_timestamp(struct timestamp_event_queue *queue,
 	spin_unlock_irqrestore(&queue->lock, flags);
 }
 
-static s32 scaled_ppm_to_ppb(long ppm)
+s32 ptp_clock_scaled_ppm_to_ppb(long ppm)
 {
 	/*
 	 * The 'freq' field in the 'struct timex' is in parts per
@@ -82,6 +82,7 @@ static s32 scaled_ppm_to_ppb(long ppm)
 	ppb >>= 13;
 	return (s32) ppb;
 }
+EXPORT_SYMBOL(ptp_clock_scaled_ppm_to_ppb);
 
 /* posix clock implementation */
 
@@ -137,7 +138,7 @@ static int ptp_clock_adjtime(struct posix_clock *pc, struct __kernel_timex *tx)
 		delta = ktime_to_ns(kt);
 		err = ops->adjtime(ops, delta);
 	} else if (tx->modes & ADJ_FREQUENCY) {
-		s32 ppb = scaled_ppm_to_ppb(tx->freq);
+		s32 ppb = ptp_clock_scaled_ppm_to_ppb(tx->freq);
 		if (ppb > ops->max_adj || ppb < -ops->max_adj)
 			return -ERANGE;
 		if (ops->adjfine)
diff --git a/include/linux/ptp_clock_kernel.h b/include/linux/ptp_clock_kernel.h
index 28eb9c792522..fc59d57640a5 100644
--- a/include/linux/ptp_clock_kernel.h
+++ b/include/linux/ptp_clock_kernel.h
@@ -212,6 +212,14 @@ extern void ptp_clock_event(struct ptp_clock *ptp,
 
 extern int ptp_clock_index(struct ptp_clock *ptp);
 
+/**
+ * ptp_clock_scaled_ppm_to_ppb() - convert scaled ppm to ppb
+ *
+ * @ppm:    Parts per million, but with a 16 bit binary fractional field
+ */
+
+extern s32 ptp_clock_scaled_ppm_to_ppb(long ppm);
+
 /**
  * ptp_find_pin() - obtain the pin index of a given auxiliary function
  *
-- 
2.20.1